Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb50af39fa85702…

MALICIOUS

PDF

75.9 KB Created: 2021-04-04 06:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6715703fb71cdd998d8b57cc31e2538d SHA-1: de113ea430e816ee721c80c541fe013a8ef0d3e6 SHA-256: 0cb50af39fa8570274978d74da68255feb78270309c5ede1e929abfbc44bd42c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily corrupted, contains fragments suggesting a lure related to 'hr management pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/strik?utm_term=what+is+hr+management+pdf In PDF document text
    • https://cdn.sqhk.co/zosiwutu/4vjhicr/windranger_arcana_2020_release_date.pdfIn PDF document text
    • http://furunud.22web.org/public_speaking_drive.pdfIn PDF document text
    • http://sosutisokalelul.iblogger.org/excel_vba_array_formula_worksheetfunction.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/jcVgfje/nedimowajoko.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/IicWAhc/word_farm_cross_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xogedusov/mOhfkig/girakepasuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78f121e6-5824-477f-9480-4bf23eba804c.filesusr.com/ugd/9564ad_de9edadd661c40e8851d81f55f99d6e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/675e5198-697e-44e2-8c9f-e9825f91f860/stanadyne_db4_fuel_injection_pump_troubleshooting.pdfIn PDF document text
    • http://wifobujaxude.epizy.com/8359171368.pdfIn PDF document text
    • http://mimosomudex.rf.gd/rheumatic_heart_disease_treatment.pdfIn PDF document text
    • http://rujugojokukasav.rf.gd/ghost_in_the_machine_police_tribute_band.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/zifubabavetalopepabeloli.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/problem_solving_method_of_teaching_science.pdfIn PDF document text
    • http://mudotepejix.epizy.com/firth_of_thames_fishing_report_2018.pdfIn PDF document text
    • http://fixokofo.rf.gd/49419908615.pdfIn PDF document text
    • http://vojamul.epizy.com/fodevipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b966bb-4fbf-4bd2-8642-969058dbf9ec/89505071184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b65c7cfc-ffd7-4c8e-8c02-283d116a7d0b/57982399841.pdfIn PDF document text
    • https://9370005b-87d8-49d8-b27c-18dce193a2f1.filesusr.com/ugd/52ea04_69ded9bde08d4de589c7449b8e9af733.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4332ab-b816-4b7c-b792-435baac7df22/36584772218.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 5436 bytes
SHA-256: b6675d34b3a51062686e3d12d1a56ae56c5f567d3acb74ffa2942a889f4936d4
font_01_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 10524 bytes
SHA-256: 7c25fa5d53daa7fbb0ab9810191ae8e1ab925bbaff2ee478ce2682966d57d08f

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